MC06XSD200FK データシートの表示（PDF） - Freescale Semiconductor

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MC06XSD200FK

Dual 6.0 mOhm High Side Switch

Freescale Semiconductor 

FUNCTIONAL DEVICE OPERATION

OPERATION AND OPERATING MODES

• short circuits to VPWR when the channel is set to Off

• VPWR < 13 V when OpenLoad-in-Off-state detection is

selected and the load is actually lost

• during the turn-on transition as long as V(HS[x])< Vpwr/2

• during the turn-off transition as long as V(HS[x]) > Vpwr/2

Entering and Maintaining Normal Mode

A 0-to-1 transition on RSTB, (when both VPWR and VDD

are present) or on any of both direct inputs IN[x] (when only

supplied by VPWR) puts the device in Normal mode. If

desired, the device can be operated in Normal mode without

VDD, but this requires that at least one of both direct inputs be

regularly turned on (Operation and Operating Modes). To

maintain the device in Normal mode (NM), communication

must take place on a regular basis.

For SPI communication, the state of the WDIN bit must be

alternated at least every 310 ms (typ.) (tWDTO), unless the

WD_disable bit is set to 1.

For direct input control, the timing requirements are shown

in Figure 10. A signal called IN_ON[x] is not directly

accessible to the user but is used by the internal logic circuitry

to determine the device state. When no activity is detected on

a direct input pin (IN[x]) for a time longer than tIN = 250 ms

(typ.), timeout is detected and IN_ON[x] goes low. When this

occurs on both channels, Sleep mode is entered (Sleep

Mode), provided reset = RSTB = 0

It enters Fail-safe mode in case of a timeout on SPI

communication or when VDD is lost after having been initially

present (if this function was previously enabled by setting:

VDD_FAIL_EN bit = [1]). Setting watchdog disabled

(WD_dis = 1, D4 of the GCR register) avoids entering Fail-

safe mode after watchdog timeout. Device behavior upon

fault occurrence is explained in the paragraph on Faults

(Fault Mode).

.

tIN

IN[x]

IN_ON[x]

Figure 10. Relation Between Signals IN(x) and IN_ON[x]

Direct Control Mode

When RSTB = 0 (and also in Fail-safe mode), the

channels are merely controlled by the direct input pins IN[x].

All protective functions (OC, OT, SC, OV, UV) are operational

including auto-retry. To avoid entering Sleep mode at

frequencies < 4.0 Hz, reset should be set to RSTB = 1.

Going from Normal to Fail-safe, Fault or Sleep Mode

The device changes from Normal to Fail-safe (Fail-safe

Mode), Sleep mode (Sleep Mode), or Fault mode (Fault

Mode), according to the value of the following signals (see

Table 5).

• wake-up = RSTB or IN_ON[0] or IN_ON[1]

• fail-safe = (VDD Failure and VDD_FAIL_en) or (SPI

watchdog timeout (tWDTO) and WD_dis = 0)

• fault = OC[0:1] or OT[0:1] or SC[0:1] or UV or (OV and

OV_dis)

Table 5. Device Operating Modes

Mode

Wake-up

Fail-

safe

Fault Comments

Sleep

0

x x All channels are OFF.

Normal

1

0 0 The SPI Watchdog is active when: VDD = 5.0 V, WD_dis = 0, RST = 1

Fail-safe

1

1 0 The channels are controlled by the IN inputs. (see page 28)

Fault

1

X 1 The channels are OFF, see page 29.

x = Don’t care.

Analog Integrated Circuit Device Data

Freescale Semiconductor

06XSD200

27

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